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Schedule of Mortgage Fee Income for Loans Held for Sale (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Loans Held For Sale |  |  |  |
Loan fees | $ 6,709,062 | $ 7,366,232 | $ 11,963,152 | $ 12,886,697
Interest income | 2,366,245 | 2,263,915 | 4,033,679 | 3,746,735
Secondary gains | 20,185,222 | 18,674,595 | 37,140,165 | 33,405,569
Change in fair value of loan commitments | 132,404 | 429,823 | 606,944 | 991,601
Change in fair value of loans held for sale | 308,074 | 1,197,075 | 949,342 | 896,185
Provision for loan loss reserve | (215,903) | (312,124) | (398,937) | (475,601)
Mortgage fee income | $ 29,485,104 | $ 29,619,516 | $ 54,294,345 | $ 51,451,186

X
- Definition Represents the monetary amount of Change in fair value of loan commitments, during the indicated time period. + References No definition available. + Details
Name: | SNFCA_ChangeInFairValueOfLoanCommitments
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in fair value of loan held for sale. + References No definition available. + Details
Name: | SNFCA_ChangeInFairValueOfLoanHeldForSale
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | SNFCA_DisclosureLoansHeldForSaleAbstract
Namespace Prefix: | SNFCA_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the monetary amount of Loan fees, during the indicated time period. + References No definition available. + Details
Name: | SNFCA_LoanFees
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Mortgage fee income. + References No definition available. + Details
Name: | SNFCA_MortgageFeeIncome
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Provision for loan loss reserve. + References No definition available. + Details
Name: | SNFCA_ProvisionForLoanLossReserve
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the monetary amount of Secondary gains, during the indicated time period. + References No definition available. + Details
Name: | SNFCA_SecondaryGains
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
Name: | us-gaap_InterestAndOtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration